Men's Tennis (ATP)
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Isner, Hewitt, Mahut into Hall of Fame quarters

Newport, RI ( - Two-time champion John Isner, two-time runner-up Lleyton Hewitt and reigning titlist Nicolas Mahut all moved into the quarterfinals at the Hall of Fame Tennis Championships on Wednesday.

The top-seeded world No. 12 Isner popped 11 aces in cruising past qualifier and fellow American Austin Krajicek 6-3, 6-3 in 63 minutes on the grounds of the International Tennis Hall of Fame.

Isner captured back-to-back titles at this event in 2011 and 2012, and is the No. 1 seed in Newport for the third time in four years. He had a 13-match winning streak at this grass-court event snapped by Hewitt in last year's semifinals.

The 6-foot-10 Isner, who threw out the ceremonial first pitch at Tuesday's Boston Red Sox game, will face fellow American Jack Sock in a quarterfinal on Friday.

The third-seeded former world No. 1 star Hewitt humbled Croatian qualifier Ante Pavic 6-2, 6-2, while the fourth-seeded French Mahut mauled Aussie Luke Saville 6-4, 6-2.

Mahut overcame the two-time Grand Slam titlist Hewitt in last year's Newport finale, as Hewitt fell for the second straight year in the championship round. Mahut was also a runner-up here in 2007.

Up next for Hewitt will be American Steve Johnson on Friday, while Mahut will face Aussie Samuel Groth on Thursday.

Second-seeded massive-serving Croat Ivo Karlovic moved on by stopping Ukrainian Sergiy Stakhovsky 7-5, 7-6 (7-3). Karlovic struck 18 aces to set-up a date with Israeli Dudi Sela on Thursday.

The sixth-seeded two-time NCAA singles champion Johnson moved into the round of eight by besting Japanese Tatsuma Ito 6-3, 2-0, retired, while a seventh- seeded Sock erased compatriot and 2009 Newport champion Rajeev Ram 7-5, 6-2, and Sela upended eighth-seeded Frenchman Adrian Mannarino 6-3, 6-1. Johnson will face Hewitt in a quarter on Friday.

Also on Day 3, Groth snuck past Tunisian Malek Jaziri 7-6 (9-7), 7-6 (7-3).

This week's champion will claim $81,500.

07/09 17:06:45 ET